Hello everybody

hello all im a newbie to the whole computer thing in ive been on here for a while reading in learning but i still dont got everything down. i have a old computer that im willing to take apart in learn from well this computer has a amd sempron , 2800 processor, 1.60ghz,in 224 mb of ram my car pc that i wish to build will have internet,mp3s,gps,movies,in voice command. what would be the best way to power this up? what kind of equipment would help me achieve this if its possible the most economical way please.since this is my first time building a computer? thank you

I would look at some of the DC-DC powersupplies available (you can read about them in the FAQ) that are ATX compliant if your system is.

Be warned that a heavy power draw CPU will require a high powered DC-DC PSU and this means $$$. Sometimes cheaper to buy a low-power draw and a cheap PSU than to keep the heavy draw and spend lots to power it.

If you have a desktop PC, it is more than likely ATX.
The suggetion to read the manual and/or the manufacturer's website is a good one.
If that doesn't yield results, open it up and look for a 20-pin (or 24-pin on newer models) power connector on the motherboard that cones from the power supply with a bundle of multi-colored wires.